Trash removing mechanism for water screens



May-30. l933 R. T .STEINDORF 1,912,020

.TRASH REMOVING MECHANISM FOR WATER SCREENS Filed Nav. 17, 1931 2sheets-sheet 1 Roberti? Stez'ndoij May 30, 1933- R. T. sTElNDoRF TRASHREMOVING MECHANISM FOR WATER SCREENS A Filed Nov.

, 1931 2 Sheets-Sheet 2 e ROBERT T. STEINDORF, OF

Patented May 30, 1933` UNITED STATES PATENT OFFICE MILVAUKEE, WISCONSIN,ASSIGNOR TO CHAIN BELT COM- PANY, OF MILWAUKEE, WISCONSIN, A COBIORATIONOF WISCONSIN TRASH IREHVlOVINC-rY MECHANISM FOR WATER SCREENSAppiication inea November 17, 1931. serial No. 575,672.

This invention relates to trash removing mechanism for water screens,and more particularly to a device for removing trash accumulations fromthe traveling scrapers :or rakes which are commonly associated withwater screens of the stationary bar type, and has for one of its objectsto provide a device of this character which will be simple inconstruction, comparatively inexpensive to manufacture and moreeiiicient in use than those which have been heretofore proposed. Y

With the above and other objects in view which will appear as thedescription pro'- ceeds, the invention consists in the novel details ofconstruction and combinations of partsmore fully hereinafter describedand particularly pointed out in the appended claims.

Referring to the accompanying` drawings forming a part of thisspecification in which like reference characters designate like parts inall the views Figure 1 is a vertical sectional view through a typicalstationary-bar trash screen, taken approximately on the plane indicatedby the line 1-1 of Figure 2, looking in the direction of the arrows, andillustrating a trash removing device constructed in accordance with thepresent invention associated therewith;

Figure 2 is a front elevational view of the parts shown in Figure 1 asseen from the lefty of the latter figure, with the forward wall of thehead frame housing omitted for the sake of clearness;

Figure 3 is an enlarged vertical sectional view of the trash removingmechanismk andits immediately associated parts shown in Figure 1; and

Figure 4 is a transverse sectional view of the parts shown in Figure .3,taken approximately on the plane indicated by the line 'i-44 of thelatter figure.

Referring more particularly to Figures 1 and 2 the trash screeninstallation, which is commonly installed in a liquid conduit 5 ofconcrete, comprises a screen grid y6 composed of spaced bars 7 which isset into the con#k duit 5 transversely thereof and usually in aninclined position substantially as shown.

The function of the bar screen 6 is to remove from the liquid flowingthrough the conduit 5 the larger debris and trash, which accumulates.upon the forward surfaces of the bars 7, as will be readily understood.In order to remove such trash accumulations from the bars there isusually provided a scraper mechanism or rake as it is commonly termed,comprising a substantially flat bar or sheet 8, one edge of which isserrated or notched as at 9 to coact with the screen bars 7 as will bereadily understood. The said rake 8 is secured to and carried by thespaced endless chains or belts 10 which are trained about head sprockets11and foot sprockets 12 earried respectively by the head shaft 13 andthe foot shaft` 14 journalled in suitable bearings 15 and 16respectively. Power is supplied to the head shaft 13 by a suitable motorand speed reducer indicated at 17 through sprocket 18, chain 19 and'sprocket 2O carried by the head shaft 18.

In order to support and guide the uprun of the chains 10 there isprovided adjacent each wall of the conduit 5 the angle chain-guides orsupporting members 21, upon the inwardly projecting flange of which thechains slide,`as will be readily understood from the drawings. The rakeor trash removing member 8 is thus guided during its upward travel andits notches 9 engage the faces of the screen bars 7 and scrape theaccumulated trash or other debris therefrom, moving the` latter upwardlybeyond the upper ends of the bars.

The bars 7 terminate at approximately the top of the conduit 5 andabovev this point there is erected a head iframe including suitableuprights such as 22 and 23, and a housing 24. A suitable receiver 25 ispositioned within the said housing to receive the trash accumulationsfrom the rake 8 and since some water'is necessarily carried along withsuch trash accumulations the drain 26 is provided for returning suchwater as may drain from the trash to the ychamber 27 from which it mayreturn through passage 28 to the rear of the screen 6, see Figure r1.

Vhile the refuse screened from the water by'a screen of this type isgenerally of more or less large character and in many instances will ofitself slide off of the rake 8, at the same time there is usuallypresent some refuse which clings to the said rake and requiresassistance in being removed therefrom.

For scraping such refuse from the rake, the present invention providesthe oppositely disposed horizontally inclined channel guides ortrack-ways 30 which are carried by suitable supports 3l secured to theframe members 22 and 23, as best shown in Figures 3 and 4. A carriage 32comprising side frame members 33, a transverse angle member 34 extendingbetween and rigidly secured at its ends to said members 33, and wheelsor rollers 35 which are journalled as at 36 to the said side members 33,is mounted for rectilinear motion on the said trackways 30. As will beclear from Figures 2, 3 and 4 the supports 31, track-ways 30 andcarriage frame members 33 'are disposed outside of the chains l0 andtheir guides 21, while the cross bar or angle 34 extends across from oneside member 33 to theother behind the chains l0 and guides 21. Securedto and extending from the cross angle 34 between the chains l0 is aplate or scraper member 37 having an angularly disposed portion 38 whichis normally adapted to lie in the path of travel of the rake 8, asclearly shown in full lines in Figure 3.

Since the carriage 32 and the scraper 37 carried thereby maymove freelybackward and forward along the channel track-ways 30, it will be readilyapparent that as the rake 8 is advanced upwardly by the chains l0, asindicated by the arrow in Figure 3, it will push before it the scrapermember 37. This motion will be transmitted to the cross member 34 andframe members 33 and the entire carriage together with the scraper.member 37 will be moved upwardly and toward the right as viewed inFigure 3, the wheels 35 rolling in the channel track-ways 30. Suchmovement will of course draw the lower edge of the angular portion 38across the upper surface of the rake 8, scraping therefrom anyaccumulated trash or debris and causing the latter to be deposited intothe receiver 25. As the upward motion of the rake continues the carriagev32 and scraper 37 will reach the broken line position shown in Figure3, where the right hand edge of the rake 8 will clear the angularportion 38 of the scraper, thus permitting the rake to pass by andcontinue its circuit. After the rake has passed, the carriage 32,together with the scraper member 37 will reverse its movement and returnto the left, as kviewed in Figure 3, under the action of gravity so asto be in substantially the full line position indicated in the saidFigure as the rake again approaches after its next cleaning operation ofthe screen bars 7. The carriage 32 will be prevented from moving too farto the left through engagement of thercross bar 34 with the rear facesof the chain guiding angles 21, as will be readily apparent.

It is obvious that those skilled in the art may vary the details ofconstruction as well as the precise arrangement of parts withoutdeparting from the spirit of the invention, and therefore it is notwished to be limited to .the above disclosure except as may be requiredby the claims.

What is claimed is: A

l. In trash removing mechanism for trash screens having a travelingcleaning member, inclined supports positioned in co-operative relationto the path ofsaid cleaning member; and means rectilinear-ally movablein said supports and engageable with the surface of said cleaning membertoremove trash accumulations therefrom.

2. In trash removing mechanism for trash screens having a travelingcleaning member, guides disposed at an angle to the path of saidcleaning member; and meansreciprocably mounted in said guidesvengageable with the trash-receiving surface of said cleaning member andmovable in said guides through the travel of said member to sweep acrosssaid surface and remove trash accumulations therefrom.

3. In trash removing mechanism for trash screens having a travelingcleaning member, spaced inclined guides disposed transversely of thepath of travel of said cleaning member; a frame mounted in said guidesfor rectilinear reciprocating movement toward and fromrsaid path oftravel; and a scraper carried by said frame, engageable with thetrash-receiving surface of said cleaning member, saidv frame andvscraper being movable in one direction through the travel of saidmember, tocause the scraper to sweep across said trash-receiving surfaceand remove trash accumulations therefrom. v 4. In trashremovingmechanism for trash screens having a traveling cleaning member, spacedsupports inclined from the horizontal disposed transversely of thepath'of travel of said cleaning member; a frame mounted on sai-dsupports for reciprocating movement t0- ward and from said path oftravel; and a scraper carried by said frame, engageable with thetrash-receiving surface of said cleaning member, said frame and scrapervbeing movable up the incline of said supports through the travel ofsaid member, to cause the scraper to sweep' across said trash-receivingsurface and remove trash accumulations therefrom, said frame and scrapermoving down said incline under the inuence of gravity after saidcleaning member has passed.

5. In trash removing mechanism for trash screens having a travelingcleaning member, a pair of horizontally inclined spaced trackwaysVVintersecting the plane'of travel of said cleaning member; acarriagefra-me having rollers mounting it for reoiprocation on said traokways;and a scraper carried by said frame, engageable with the trash-receivingsurface of said cleaning member, said frame and scraper being movable upthe incline of said trackvvays through the travel of said member, tocause the scraper to sweep across said trash-receiving surface andremove trash accumulations therefrom, said frame and scraper moving downsaid incline under the influence of gravity after said cleaning memberhas passed.

In testimony whereof, I aix my signature.

ROBERT T. STEINDORF.

